style(component, directive, model): add types to whole project

[Amit775]

PR Checklist

Please check if your PR fulfills the following requirements:

• [V] The commit message follows our guidelines: https://github.com/CirclonGroup/angular-tree-component/blob/master/CONTRIBUTING.md#commit-message-guidelines
• [-] Tests for the changes have been added (for bug fixes / features) (not relevant)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[V] Code style update (formatting, local variables) - add types
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Some of the functions and models have type any. As a developer who used this awesome library I found that inconvenient.

Closes #

What is the new behavior?

Adding types to each method, model, variable etc. so a developer who use this library or contribute to this library have better intelisense and develop experience.

Does this PR introduce a breaking change?

no, for my knowledge

[ ] Yes
[V] No

Other information